Question

‘X’ is a widely used capacitor which consists of two large plane parallel conducting plates separated by a small distance. Identify X.

(a) Spherical capacitor

(b) Parallel plate capacitor

(c) Cylindrical capacitor

(d) Electrolytic capacitor

I had been asked this question in an international level competition.

My enquiry is from Parallel Plate Capacitor topic in division Electrostatic Potential and Capacitance of Physics – Class 12

Answer 1

Correct answer is (b) Parallel plate capacitor

The best I can explain: The simplest and the most widely used capacitor is the parallel plate capacitor. It consists of two large plane parallel conducting plates, separated by a small distance.

Capacitance of a parallel plate capacitor = \(\frac {Q}{V} = [ \frac {\sigma A}{(\frac {\sigma d}{\varepsilon_0})} ] = \frac {A\varepsilon_0}{d}\).